had the previous generation for 5 years and loved it. This one is even better than the previous one with a better driver, speed, quieter, more robust etc. Bought 2 more after getting a good taste of the GK420d. It is compatible with UPS, Stamps.com, Worldship, Windows 10, Windows 8, Windows 8 Pro, Windows 7 without any problems so far. I'll update the review if anything else comes up.
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